Adult length measurements are available from only three animals: (1) a pregnant female that stranded in the Maldives in January 2000 was 6 m long (curvilinear measurement) and (2) a physically mature female that stranded in Kagoshima, Japan in July 2002 was 6,5 m long, which may be a maximum for this species, and (3) a 5,65 m female (and her 4,2 m calf) stranded in Taiwan in 2005.